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Type: Artigo de periódico
Title: Characterisation and properties of the inclusion complex of 24-epibrassinolide with beta-cyclodextrin
Author: De Azevedo, MBM
Zullo, MAT
Alderete, JB
De Azevedo, MMM
Salva, TJG
Duran, N
Abstract: This paper reports the first study of an inclusion complex of a brassinosteroid with beta-cyclodextrin. The formation of inclusion complexes between 24-epibrassinolide and beta-cyclodextrin was confirmed by their physicochemical properties and the compounds were analysed by differential scanning calorimetry, powder X-ray diffraction, nuclear magnetic resonance spectrometry and scanning electron microscopy. Theoretical calculations using the MM+ HyperChem force field showed a preference for inclusion of the side chain of the epibrassinolide molecule into the beta-cyclodextrin cavity to form a 1:1 inclusion complex, although complexes involving inclusion of the steroidal nucleus also possess a favourable interaction energy. Rice lamina inclination assay, employing IAC-103 and IAC-104 cultivars, showed an improved activity for the epibrassinolide-cyclodextrin complex compared to the epibrassinolide itself. The results suggest that brassinosteroid complexation with cyclodextrins may enhance the biological activity of these plant growth regulators.
Subject: beta-cyclodextrin
inclusion complex formation
rice lamina inclination assay
thermal analysis
X-ray diffraction analysis
Country: Holanda
Editor: Springer
Citation: Plant Growth Regulation. Springer, v. 37, n. 3, n. 233, n. 240, 2002.
Rights: fechado
Identifier DOI: 10.1023/A:1020842727497
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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